ASUS DAV Center 33RAmplifier featuresYour ASUS DAV Center A33/A31 comes with a built-in amplifier. The amplifier features enable you to optimizeyour listening environment with a touch of the button, saving you from complex audio setup procedures.LEO (Listening Environment Optimizer)The LEO™ technology virtually adjusts your speaker placement to deliver an excellent audio experience. Witha microphone placed at the listener’s location, LEO™ sends out test tones to each speaker and analyzes thefeedback signal to determine speaker distance, phase, sound pressure level, and related parameters.To activate the LEO™ function:1. Plug the microphone into the microphone jackon the A33/A31 front panel and place it at yourlistening location.;9(/+++396. A dialog box pops up to show that an audiodevice is detected. Click OK.3. Click OK to confirm the setup.4. Press the LEO button on your amplifierremote.5. Click OK to enter the LEO testing mode.